Design And Implementation Of Real-time Signal Processing For Distributed Coherent Synthetic Radar On Moving Platform

With the national defense modernization process of various countries,the war environment has become increasingly complex,and the disadvantages of poor anti-jamming capabilities,weak detection performance,and low detection accuracy of weapons in separate operations have become prominent.Modern weapons are developing in the direction of multi-platform coordination and integrated operations.The application of distributed coherent synthesis technology to movement platforms such as missiles and unmanned aerial vehicles can improve their anti-jamming capabilities,anti-destroy capabilities,and target detection capabilities.Therefore,the distributed coherent synthesis technology of moving platforms will be a hot research topic for the next generation of guided weapons.Based on this background,this paper conducts simulation analysis and hardware realization of the distributed coherent synthesis technology of the dynamic platform,and conducts joint debugging of the entire hardware system to verify the feasibility of the dynamic platform scheme.The main work of this thesis is as follows:1.This article first designs a mobile platform distributed system scheme,expounds the principles of receiving coherence and full coherence,and performs three-dimensional modeling of the mobile platform system.Target detection is carried out according to relevant parameters to obtain target information.The influence of parameter estimation errors on the coherent synthesis of moving platform is studied from the four aspects of delay,phase,speed and positioning error,and the feasibility of hardware implementation of coherent synthesis of moving platform is verified by simulation.In view of the real-time change of the baseline of the moving platform,parameter estimation and compensation are carried out for the time synchronization error between platforms.2.In order to verify the performance of the distributed coherent synthesis system of the mobile platform,the system implementation scheme of the infield air feed and line feed was designed,the communication protocol of the FPGA+DSP signal processing board was studied,and the data receiving and returning process was designed.And to test and debug it to ensure accurate and efficient data transmission.In order to better analyze the influence of various error-sensitive factors on the coherent synthesis and verify the feasibility of the distributed system of the dynamic platform,the GUI software interface of the dynamic platform is designed to facilitate subsequent analysis and debugging.3.In order to realize the real-time signal processing requirements of multi-core DSP,the calculation amount of signal processing is analyzed to reduce unnecessary calculations.From the perspective of multi-core collaborative work,design the overall real-time processing scheme,data splitting and splicing scheme,inter-core communication and synchronization scheme,etc.to optimize the hardware of the multi-core DSP.From the perspective of code efficiency,study memory,code,compiler optimization,etc.to optimize the software of multi-core DSP,so that DSP can achieve the effect of real-time signal processing.4.Verify the benefits of coherent synthesis when there are errors under the three conditions of simulation data,internal field line feed and internal field RF component line feed,and analyze the effect of synthesizing the benefits after the error is compensated.The simulation data is verified through the GUI interface,and the measured data is debugged through the host computer interface.Comparing the AD raw echo MATLAB processing and DSP processing results,the error accuracy is on the order of the negative fourth power of ten.Finally,multiple sets of data are tested by radio frequency components to verify the feasibility of distributed coherent synthesis of the dynamic platform when multiple errorsensitive factors exist.